1,I am looking to buy airticket to nepal from chicago, my questions are if the air makes stops in europe or India before I can board a flight to KTM, do I need to get transit visa?

2, if I buy  roundtrip ticket and I have to stay big longer in Nepal, is there anyway I can extend my return flight  ?

3, which airlines or online travel site you recommend to book tickets?

4, which following months have cheaper rates, NOV, DEC or JAN?

5,How do I apply for Nepal visa? just send my  green card and re entry permit document with fees to New york nepalese embassy?

6, how long the visa is issued or do I have to ask for  1, 2, 3 months ?

7, finally, what is better, book air ticket first or get visa first?

thanks!